Improvement in boiler-flue cleaners



UNITED STATES PATENT OFFICE;

T HENRY'LEHMANN, OF CLEVELAND, OHIO.

IMPROVEMENT IN BOILER-FLUE CLEANERS.

Specification forming part of Letters Patent No. 153,441, dated July 28,1874; application led June 26,1874.

To all whom it may concern:

Be it known that I, HENRY LEHMANN, of Cleveland, in the county ofCuyahoga and State of Ohio, have invented an Improved Boiler-FlueCleaner, of which the following is a specification:

This invention relates to a scraper for oleaning boiler-dues; andconsists of four spring'- bars, having each a scraper attached, saidbars being united at the butt to a head, through which a rod passes,having a screwthread cut on it for that purpose, and having a nut orhead on the end between the bars, which is designed for expanding thebars, so that they may tit the inside of a flue tightly, or readilyadapt the Scrapers to the unevenness or slight variations there may betherein.

To enable others to fully understand my invention, I will proceed todescribe the same by the aid of the accompanying drawing,'in which-Figure 1 is a side elevation, and Fig. 2 is an y end view, of myaforesaid flue scraper.

A A represent four Eat bars of steel united to a head, B, with theirflat sides outward, but which are at a point about two-thirds theirlength from the butt, twisted one-quarter-way round, so as t0 bringtheir edges to the side, and the outer edges of the said bars are curvedinward to the inside edges, thus making the points in a smallercircumference. To each of the bars A is attached a quarter-disk scraper,C, lapping each otherat the intersecting line, so that they maintain acomplete circumference at all times. Through the head B is passed a rod,D, it having a screw-thread c ut on it for the nutsE E, which secure therod in place in the head. Upon the inner end of the rod D is placed awasher, F, held in place by two nuts, G G. The washer is for expandingthe bars, and thus adjusting the scrapers to fit snugly the insidesotvarious-sized flues, the spring of the bars also causing the scrap ersto bear harder on the inside.

This scraper has proved, after about a years use, to be perfect in itswork, and accomplishes what no other line-scraper has done.

Having described my invention, l claim- Bars A A, united, to the head B,and having the scraper C C, the rod D, nuts E E, washer F, and nuts G G,all combined, as shown and described, to compose a flue-scraper, for thepurpose set forth.

HENRY LEHMANN.

lTtnessesz GEO. W. Tinnrr'rs, W. S. KENNISH.

